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    <p>What I did in my application for one similar task:</p> <ol> <li><p>To check that a modem is connected to particular port you can send AT command into this port. This function below returns true if we found a modem on the current COM port:</p> <pre><code>private bool CheckExistingModemOnComPort(SerialPort serialPort) { if ((serialPort == null) || !serialPort.IsOpen) return false; // Commands for modem checking string[] modemCommands = new string[] { "AT", // Check connected modem. After 'AT' command some modems autobaud their speed. "ATQ0" }; // Switch on confirmations serialPort.DtrEnable = true; // Set Data Terminal Ready (DTR) signal serialPort.RtsEnable = true; // Set Request to Send (RTS) signal string answer = ""; bool retOk = false; for (int rtsInd = 0; rtsInd &lt; 2; rtsInd++) { foreach (string command in modemCommands) { serialPort.Write(command + serialPort.NewLine); retOk = false; answer = ""; int timeout = (command == "AT") ? 10 : 20; // Waiting for response 1-2 sec for (int i = 0; i &lt; timeout; i++) { Thread.Sleep(100); answer += serialPort.ReadExisting(); if (answer.IndexOf("OK") &gt;= 0) { retOk = true; break; } } } // If got responses, we found a modem if (retOk) return true; // Trying to execute the commands without RTS serialPort.RtsEnable = false; } return false; } </code></pre></li> <li><p>On the next stage we can collect some data from the modem. I used the following commands:</p> <ul> <li><strong>ATQ0</strong> - switch on confirmations (receive OK on each request)</li> <li><strong>ATE0</strong> - switch on echo</li> <li><strong>ATI</strong> - get modem details</li> <li><strong>ATI3</strong> - get extended modem details (not all modems supports this command)</li> </ul></li> </ol>
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    1. POFind gsm modem port in c#
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    1. USAlex Klaus
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      1. USYohan Weerasinghe
 

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